Family Fissurellidae
Diodora cayenensis
(Lamarck, 1822)
Cayenne keyhole limpet - 40 mm

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Shell elevated, elliptical. Keyhole elongate. Sculpture of numerous radial riblets of which every third or fourth is larger. Color buff, white, or dark-gray. The picture of the live specimen was taken by Amy Tripp near Marco Island.